Timestamp header

[sriram]

Hi all
I want to create a timestamp header in my program which keeps track of
the event number and the exp.num.
Can anyone plz provide a C program to do one such.
The header is of 1byte and 2 bits for the exp number and remaining for
the event number.
Thanks in advance
sriram

 

[Malcolm]

I want to create a timestamp header in my program which keeps track > of

the event number and the exp.num.

Can anyone plz provide a C program to do one such.
The header is of 1byte and 2 bits for the exp number and remaining for
the event number.

I'm afraid that you are not specifying your problem very well.
By "byte" do you mean 8 bits? Or do you mean the smallest addressable unit
of memory on whatever architecture you happen to be running on?

What do you mean by "whatever remaining?" Do you mean that byte-2 bits
should be the event number?

Anyway, you probably want this

typedef struct
{
unsigned int expnum : 10;
unsigned int eventnum : 6;
} HEADER;

This will give you 10 bits for expnum, and 6 bits for eventnum.

If you really do mean "architecture-dependent minimum unit of addressable
memory" by byte, then unfortunately the problem becomes a lot more
complicated. You will have to mess about with the constant CHAR_BIT to make
the bitfields the right size.